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Swift-XRT spectra of GRB 120811C

Last updated after receiving ObsID 00530689002, version 12.

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The spectral fits assume a redshift: 2.671 (GCN 13628)

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Time-averaged spectrum (T0 + 74 to 99096 s)

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WT and PC mode spectra of GRB 120811C

WT mode. Mean photon arrival: T0+111 s

N_H (Galactic)	2.1 × 10²⁰ cm^-2
N_H (intrinsic)	9.8 (+2.3, -2.1) × 10²¹ cm^-2
z of absorber	2.671
Photon index	2.56 (+0.11, -0.10)
Flux (0.3-10 keV) (Observed)	4.61 (+0.23, -0.22) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	6.742 (+0.050, -0.498) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	2.5 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	3.7 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	306.39 (382)
Exposure time	137 s

PC mode. Mean photon arrival: T0+10886 s

N_H (Galactic)	2.1 × 10²⁰ cm^-2
N_H (intrinsic)	8.3 (+4.0, -3.7) × 10²¹ cm^-2
z of absorber	2.671
Photon index	1.92 (+0.12, -0.11)
Flux (0.3-10 keV) (Observed)	6.55 (+0.51, -0.47) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	7.72 (+0.51, -0.45) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.7 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.3 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	346.50 (345)
Exposure time	11.3 ks

Late Time spectrum (T0 + 11469 to 99096 s)

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PC mode spectrum of GRB 120811C

PC mode. Mean photon arrival: T0+26849 s

N_H (Galactic)	2.1 × 10²⁰ cm^-2
N_H (intrinsic)	1.03 (+0.64, -0.57) × 10²² cm^-2
z of absorber	2.671
Photon index	2.24 (+0.21, -0.20)
Flux (0.3-10 keV) (Observed)	1.58 (+0.19, -0.17) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.08 (+0.24, -0.24) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.2 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.2 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	190.37 (213)
Exposure time	10.0 ks